[PATCH net-next 1/8] net: ipa: introduce gsi_reg_init()
From: Alex Elder
Date: Fri Feb 10 2023 - 14:37:22 EST
Create a new source file "gsi_reg.c", and in it, introduce a new
function to encapsulate initializing GSI registers, including
looking up and I/O mapping their memory.
Create gsi_reg_exit() as the inverse of the init function.
Signed-off-by: Alex Elder <elder@xxxxxxxxxx>
---
drivers/net/ipa/Makefile | 4 +--
drivers/net/ipa/gsi.c | 52 ++++++----------------------
drivers/net/ipa/gsi_reg.c | 71 +++++++++++++++++++++++++++++++++++++++
drivers/net/ipa/gsi_reg.h | 35 ++++++++++---------
4 files changed, 103 insertions(+), 59 deletions(-)
create mode 100644 drivers/net/ipa/gsi_reg.c
diff --git a/drivers/net/ipa/Makefile b/drivers/net/ipa/Makefile
index 8cdcaaf58ae34..166ef86f7ad3f 100644
--- a/drivers/net/ipa/Makefile
+++ b/drivers/net/ipa/Makefile
@@ -7,8 +7,8 @@ IPA_VERSIONS := 3.1 3.5.1 4.2 4.5 4.7 4.9 4.11
obj-$(CONFIG_QCOM_IPA) += ipa.o
ipa-y := ipa_main.o ipa_power.o ipa_reg.o ipa_mem.o \
- ipa_table.o ipa_interrupt.o gsi.o gsi_trans.o \
- ipa_gsi.o ipa_smp2p.o ipa_uc.o \
+ ipa_table.o ipa_interrupt.o gsi.o gsi_reg.o \
+ gsi_trans.o ipa_gsi.o ipa_smp2p.o ipa_uc.o \
ipa_endpoint.o ipa_cmd.o ipa_modem.o \
ipa_resource.o ipa_qmi.o ipa_qmi_msg.o \
ipa_sysfs.o
diff --git a/drivers/net/ipa/gsi.c b/drivers/net/ipa/gsi.c
index 2cb1710f6ac3f..a000bef49f8e5 100644
--- a/drivers/net/ipa/gsi.c
+++ b/drivers/net/ipa/gsi.c
@@ -1,7 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2015-2018, The Linux Foundation. All rights reserved.
- * Copyright (C) 2018-2022 Linaro Ltd.
+ * Copyright (C) 2018-2023 Linaro Ltd.
*/
#include <linux/types.h>
@@ -2241,67 +2241,37 @@ int gsi_init(struct gsi *gsi, struct platform_device *pdev,
enum ipa_version version, u32 count,
const struct ipa_gsi_endpoint_data *data)
{
- struct device *dev = &pdev->dev;
- struct resource *res;
- resource_size_t size;
- u32 adjust;
int ret;
gsi_validate_build();
- gsi->dev = dev;
+ gsi->dev = &pdev->dev;
gsi->version = version;
/* GSI uses NAPI on all channels. Create a dummy network device
* for the channel NAPI contexts to be associated with.
*/
init_dummy_netdev(&gsi->dummy_dev);
-
- /* Get GSI memory range and map it */
- res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "gsi");
- if (!res) {
- dev_err(dev, "DT error getting \"gsi\" memory property\n");
- return -ENODEV;
- }
-
- size = resource_size(res);
- if (res->start > U32_MAX || size > U32_MAX - res->start) {
- dev_err(dev, "DT memory resource \"gsi\" out of range\n");
- return -EINVAL;
- }
-
- /* Make sure we can make our pointer adjustment if necessary */
- adjust = gsi->version < IPA_VERSION_4_5 ? 0 : GSI_EE_REG_ADJUST;
- if (res->start < adjust) {
- dev_err(dev, "DT memory resource \"gsi\" too low (< %u)\n",
- adjust);
- return -EINVAL;
- }
-
- gsi->virt_raw = ioremap(res->start, size);
- if (!gsi->virt_raw) {
- dev_err(dev, "unable to remap \"gsi\" memory\n");
- return -ENOMEM;
- }
- /* Most registers are accessed using an adjusted register range */
- gsi->virt = gsi->virt_raw - adjust;
-
init_completion(&gsi->completion);
+ ret = gsi_reg_init(gsi, pdev);
+ if (ret)
+ return ret;
+
ret = gsi_irq_init(gsi, pdev); /* No matching exit required */
if (ret)
- goto err_iounmap;
+ goto err_reg_exit;
ret = gsi_channel_init(gsi, count, data);
if (ret)
- goto err_iounmap;
+ goto err_reg_exit;
mutex_init(&gsi->mutex);
return 0;
-err_iounmap:
- iounmap(gsi->virt_raw);
+err_reg_exit:
+ gsi_reg_exit(gsi);
return ret;
}
@@ -2311,7 +2281,7 @@ void gsi_exit(struct gsi *gsi)
{
mutex_destroy(&gsi->mutex);
gsi_channel_exit(gsi);
- iounmap(gsi->virt_raw);
+ gsi_reg_exit(gsi);
}
/* The maximum number of outstanding TREs on a channel. This limits
diff --git a/drivers/net/ipa/gsi_reg.c b/drivers/net/ipa/gsi_reg.c
new file mode 100644
index 0000000000000..48f81fc24f39d
--- /dev/null
+++ b/drivers/net/ipa/gsi_reg.c
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/* Copyright (C) 2023 Linaro Ltd. */
+
+#include <linux/platform_device.h>
+#include <linux/io.h>
+
+#include "gsi.h"
+#include "gsi_reg.h"
+
+/* GSI EE registers as a group are shifted downward by a fixed constant amount
+ * for IPA versions 4.5 and beyond. This applies to all GSI registers we use
+ * *except* the ones that disable inter-EE interrupts for channels and event
+ * channels.
+ *
+ * The "raw" (not adjusted) GSI register range is mapped, and a pointer to
+ * the mapped range is held in gsi->virt_raw. The inter-EE interrupt
+ * registers are accessed using that pointer.
+ *
+ * Most registers are accessed using gsi->virt, which is a copy of the "raw"
+ * pointer, adjusted downward by the fixed amount.
+ */
+#define GSI_EE_REG_ADJUST 0x0000d000 /* IPA v4.5+ */
+
+/* Sets gsi->virt_raw and gsi->virt, and I/O maps the "gsi" memory range */
+int gsi_reg_init(struct gsi *gsi, struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ resource_size_t size;
+ u32 adjust;
+
+ /* Get GSI memory range and map it */
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "gsi");
+ if (!res) {
+ dev_err(dev, "DT error getting \"gsi\" memory property\n");
+ return -ENODEV;
+ }
+
+ size = resource_size(res);
+ if (res->start > U32_MAX || size > U32_MAX - res->start) {
+ dev_err(dev, "DT memory resource \"gsi\" out of range\n");
+ return -EINVAL;
+ }
+
+ /* Make sure we can make our pointer adjustment if necessary */
+ adjust = gsi->version < IPA_VERSION_4_5 ? 0 : GSI_EE_REG_ADJUST;
+ if (res->start < adjust) {
+ dev_err(dev, "DT memory resource \"gsi\" too low (< %u)\n",
+ adjust);
+ return -EINVAL;
+ }
+
+ gsi->virt_raw = ioremap(res->start, size);
+ if (!gsi->virt_raw) {
+ dev_err(dev, "unable to remap \"gsi\" memory\n");
+ return -ENOMEM;
+ }
+ /* Most registers are accessed using an adjusted register range */
+ gsi->virt = gsi->virt_raw - adjust;
+
+ return 0;
+}
+
+/* Inverse of gsi_reg_init() */
+void gsi_reg_exit(struct gsi *gsi)
+{
+ gsi->virt = NULL;
+ iounmap(gsi->virt_raw);
+ gsi->virt_raw = NULL;
+}
diff --git a/drivers/net/ipa/gsi_reg.h b/drivers/net/ipa/gsi_reg.h
index d171f65d41983..60071b6a4d32e 100644
--- a/drivers/net/ipa/gsi_reg.h
+++ b/drivers/net/ipa/gsi_reg.h
@@ -1,12 +1,12 @@
/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2015-2018, The Linux Foundation. All rights reserved.
- * Copyright (C) 2018-2022 Linaro Ltd.
+ * Copyright (C) 2018-2023 Linaro Ltd.
*/
#ifndef _GSI_REG_H_
#define _GSI_REG_H_
-/* === Only "gsi.c" should include this file === */
+/* === Only "gsi.c" and "gsi_reg.c" should include this file === */
#include <linux/bits.h>
@@ -38,20 +38,6 @@
* (though the actual limit is hardware-dependent).
*/
-/* GSI EE registers as a group are shifted downward by a fixed constant amount
- * for IPA versions 4.5 and beyond. This applies to all GSI registers we use
- * *except* the ones that disable inter-EE interrupts for channels and event
- * channels.
- *
- * The "raw" (not adjusted) GSI register range is mapped, and a pointer to
- * the mapped range is held in gsi->virt_raw. The inter-EE interrupt
- * registers are accessed using that pointer.
- *
- * Most registers are accessed using gsi->virt, which is a copy of the "raw"
- * pointer, adjusted downward by the fixed amount.
- */
-#define GSI_EE_REG_ADJUST 0x0000d000 /* IPA v4.5+ */
-
/* The inter-EE IRQ registers are relative to gsi->virt_raw (IPA v3.5+) */
#define GSI_INTER_EE_SRC_CH_IRQ_MSK_OFFSET \
@@ -400,4 +386,21 @@ enum gsi_generic_ee_result {
GENERIC_EE_NO_RESOURCES = 0x7,
};
+/**
+ * gsi_reg_init() - Perform GSI register initialization
+ * @gsi: GSI pointer
+ * @pdev: GSI (IPA) platform device
+ *
+ * Initialize GSI registers, including looking up and I/O mapping
+ * the "gsi" memory space. This function sets gsi->virt_raw and
+ * gsi->virt.
+ */
+int gsi_reg_init(struct gsi *gsi, struct platform_device *pdev);
+
+/**
+ * gsi_reg_exit() - Inverse of gsi_reg_init()
+ * @gsi: GSI pointer
+ */
+void gsi_reg_exit(struct gsi *gsi);
+
#endif /* _GSI_REG_H_ */
--
2.34.1